Augmented anandamide signalling in the substantia nigra pars reticulata 
mediates panicolytic-like effects in mice confronted by Crotalus durissus 
terrificus pit vipers

Almada, Rafael C.; Falconi-Sobrinho, Luiz Luciano; da Silva, Juliana A.; Wotjak, Carsten T.; Coimbra, Norberto C.

doi:10.1007/s00213-022-06127-3

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Augmented anandamide signalling in the substantia nigra pars reticulata mediates panicolytic-like effects in mice confronted by Crotalus durissus terrificus pit vipers

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Wotjak, Carsten T.
RG Carsten Wotjak, Neuronal Plasticity, Dept. Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Max Planck Society;

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Citation

Almada, R. C., Falconi-Sobrinho, L. L., da Silva, J. A., Wotjak, C. T., & Coimbra, N. C. (2022). Augmented anandamide signalling in the substantia nigra pars reticulata mediates panicolytic-like effects in mice confronted by Crotalus durissus terrificus pit vipers. PSYCHOPHARMACOLOGY. doi:10.1007/s00213-022-06127-3.

Cite as: https://hdl.handle.net/21.11116/0000-000A-A9CE-0

Abstract

Rationale The endocannabinoid modulation of fear and anxiety due to the on-demand synthesis and degradation is supported by a large body of research. Although it has been proposed that anandamide (AEA) in the substantia nigra pars reticulata (SNpr) seems to be important for the organisation of innate fear-related behaviours, a role for endogenous AEA has yet to be clarified. Methods Mice were treated with the fatty acid amide hydrolase (FAAH) selective inhibitor URB597 at different concentrations (0.01, 0.1, 1 nmol/0.1 mu L) in the SNpr and confronted by rattlesnakes (Crotalus durissus terrificus). The most effective dose of URB597 (1 nmol) was also preceded by microinjections of the CB1 receptor antagonist AM251 (0.1 nmol) into the SNpr, and mice were then confronted by the venomous snake. Results URB597 (0.1 and 1 nmol) in the SNpr decreased the expression of defensive behaviours such as defensive attention, escape, and time spent inside the burrow of mice confronted by rattlesnakes. Moreover, pretreatment of SNpr with AM251 suppressed these antiaversive effects of URB597 in this midbrain structure. Conclusion Overall, these data clearly indicate that the panicolytic consequences of endogenous AEA enhancement in the SNpr are mediated by CB1 receptor signalling.